CN214175894U

CN214175894U - Double-layer waterproof switch

Info

Publication number: CN214175894U
Application number: CN202023249216.1U
Authority: CN
Inventors: 刘晋前
Original assignee: Wuxing Bicycle Co ltd
Current assignee: Wuxing Bicycle Co ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-09-10
Anticipated expiration: 2030-12-29

Abstract

The utility model discloses a double-deck waterproof switch, including mutual buckle connection become switch cavity's button upper cover and button drain pan, activity set up switch cavity inside and extend to the outside button handle of button upper cover, slide setting and realize the sound contact subassembly of break-make electricity in switch cavity inside, switch cavity and button upper cover between be provided with and be used for carrying out waterproof sealing's double-deck waterproof construction to switch cavity. This double-deck waterproof switch through the inside double-deck waterproof construction that sets up of button upper cover and button drain pan at mutual buckle connection, has realized the dual waterproof to the inside movable contact piece subassembly of switch cavity to make the inside electrically conductive airtight space of switch cavity effectively isolated outside aqueous vapor, realized vehicle switch's life-span and stability.

Description

Double-layer waterproof switch

Technical Field

The utility model belongs to the technical field of the switch technique and specifically relates to a be applied to green vehicle's of riding switch such as electric motor car, electric bicycle, scooter, especially relate to a double-deck waterproof switch.

Background

Be applied to the switch in green field of riding such as electric motor car, electric bicycle, scooter among the prior art, appear the inside phenomena such as lead to the fact of switching on, corruption that cause of aqueous vapor admission switch easily after the outer waterproof silica gel cap of button is damaged after the repeated operation to the life of switch and the stability of function have been influenced.

For example, chinese patent literature (publication date: 9/2010 and 22/No. CN 201590349U) discloses a power-off switch for an electric vehicle, and particularly discloses a waterproof power-off switch for an electric vehicle, which has a waterproof function. The waterproof box comprises a switch box, a box cover, a power-off switch and a waterproof cap, wherein the power-off switch is arranged in the switch box, the box cover is sleeved on the power-off switch and then covers the switch box, a screw fastener is arranged at the bottom end of the switch box, a tapered column is arranged at the end part of the screw fastener, a notch is formed in the tapered column, the screw fastener is screwed with the waterproof cap, a round hole is formed in the end part of the waterproof cap, the tapered column extends out of the round hole, and when the waterproof cap is screwed down, the waterproof cap is tightly connected to the tapered column; the side of the waterproof cap is provided with concave-convex grains. The utility model has the advantages of easy and simple to handle, firm, waterproof, tensile strength height, be applicable to various motorcycle types.

Although the technical scheme has the waterproof cap design, the waterproof cap also has the problem of breakage and failure in the long-term use process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving current switch and operating repeatedly, appearing the inside problem that causes phenomena such as switch-on, corruption after the outer waterproof silica gel cap of button is damaged that appears the aqueous vapor access switch, and provide an adopt the inside airtight space of conducting part of double-deck waterproof construction protection switch, fully isolated the aqueous vapor and got into, durability such as can effectively increase vehicle function switch, prolonged life, the stable double-deck waterproof switch of switch function.

The utility model discloses realize that the technical scheme that its invention purpose adopted does: the utility model provides a double-deck waterproof switch, includes button upper cover and button drain pan that mutual buckle connects into switch cavity, the activity sets up inside the switch cavity and extends to the outside button handle of button upper cover, slides and sets up the sound contact piece subassembly that realizes switching on and off electricity inside the switch cavity, switch cavity and button upper cover between be provided with and be used for carrying out waterproof sealing's double-deck waterproof construction to the switch cavity. This double-deck waterproof switch through the inside double-deck waterproof construction that sets up of button upper cover and button drain pan at mutual buckle connection, has realized the dual waterproof to the inside movable contact piece subassembly of switch cavity to make the inside electrically conductive airtight space of switch cavity effectively isolated outside aqueous vapor, realized vehicle switch's life-span and stability.

Preferably, the double-layer waterproof structure comprises an outer-layer primary waterproof structure and an inner-layer secondary waterproof structure.

Preferably, the outer-layer primary waterproof structure is realized by matching a key handle, a key upper cover, a key bottom shell and a silica gel waterproof cap which is pressed at the joint of the key upper cover and the key bottom shell and is in sealed sleeve joint with the key handle. The outer layer one-level waterproof structure is characterized in that a silica gel waterproof cap is arranged between the key upper cover and the key shell, and the silica gel waterproof cap is sleeved on the key handle, so that the first layer isolation is carried out on external moisture.

Preferably, the silica gel waterproof cap comprises a socket sealing body, a conical waterproof body and a buckling sealing body which are integrally arranged. Waterproof cap of silica gel an organic whole sets up and cup joints the seal, toper waterproof body and lock seal, cup joint the seal and press according to the key cap seal cover to make outside moisture can not enter into the switch cavity through waterproof cap of silica gel and button handle junction inside, and toper waterproof body then can be outside with outside water conservancy diversion to the switch, make water can not enter into the switch cavity through waterproof cap of silica gel inside, also can not store up on the switch, and the setting of lock seal is then in order to realize with the sealed cooperation of button drain pan, and make things convenient for the pressfitting of button upper cover.

Preferably, the inner-layer secondary waterproof structure is realized by matching the key bottom shell, the elastic waterproof piece which is hermetically buckled in the key bottom shell and the fixing block which is sleeved on the key handle in a sliding mode and is arranged on the upper portion of the elastic waterproof piece in a pressing mode. Inner layer second grade waterproof construction is through setting up elasticity waterproof part and fixed block inside the button drain pan, through elasticity waterproof part and button drain pan cooperation, and compress tightly the sealing to the switch cavity in the inside realization of button drain pan through the fixed block, in the use, when the button handle is pressed down, the button handle is pressed down elasticity waterproof part, thereby elasticity waterproof part warp downwards and promotes sound contact piece subassembly downwards, make the sound contact piece subassembly realize the electricity and connect, the switch-on, when needing the disconnection switch, then press down once more and loosen, button handle automatic re-setting, make sound contact piece subassembly disconnection electrically conductive. And because the waterproof piece of elasticity is realized sealedly with the button by the fixed block crimping inside the button drain pan in the use, consequently, inside even if outside one-level waterproof construction appears breaking also can not enter into the switch cavity.

Preferably, the elastic waterproof part comprises a key top pressing part, a fixed block pressing part and an arc waterproof body which are integrally arranged; the key top pressing part is arranged along the axis of the elastic waterproof body, and the fixed block pressing part is annularly arranged on the periphery of the arc waterproof body; a water retaining ring groove is arranged at the joint of the fixed block crimping part and the arc-shaped waterproof body; the fixed block comprises a sliding cylinder and a pressure joint body which are integrally arranged. Elastic waterproof piece includes the integrative button top splenium that sets up, a deformation is pressed to elastic waterproof piece for making things convenient for the button, thereby realize the break-make operation to sound contact piece subassembly, and fixed block crimping portion is for realizing with the fixed block cooperation, make things convenient for the fixed block to be sealed to elastic waterproof piece's crimping, the arc waterproof body is in case the damage has the aqueous vapor to get into for preventing outer one-level waterproof construction, then realize blockking to the aqueous vapor, and the water that is blockked then by leading-in manger plate annular inside can not get into the switch cavity inside, inlayer second grade waterproof sealing has been realized.

Preferably, the key handle is provided with a waterproof top, a sleeved necking part, a sliding part and a limiting part in an integrated coaxial line, the diameter of the waterproof top is larger than that of the sleeved necking part, and the diameter of the limiting part is larger than that of the sliding part. The button groove an organic whole is provided with waterproof top, cup joint the throat, sliding part and spacing portion, cup joint when cup jointing the throat department as waterproof cap of silica gel, waterproof top just covers waterproof cap's of silica gel end seal, thereby it enters into inside the switch cavity along the button handle from the junction to block the water, and sliding part then is in order to realize the button handle press down and the sliding fit between the fixed block, the setting of spacing portion is in order to realize the button handle reset in-process and to form spacingly between the fixed block, can not lead to the slippage between button handle and the fixed block.

Preferably, the upper part of the key bottom shell is integrally provided with an external buckling sealing part and an internal buckling sealing part, the external buckling sealing part is annularly arranged on an outer shell of the opening end of the key bottom shell, the internal buckling sealing part is annularly arranged on the inner wall of the key bottom shell, a shell buckling structure is arranged outside the shell of the key bottom shell, the bottom of the key bottom shell is provided with a movable and static contact piece assembly extending hole, and the inner wall of the key bottom shell is longitudinally provided with a sliding guide convex strip; the upper cover of the key is provided with an upper cover buckling structure matched with the shell buckling structure. Set up outside lock sealing part on the button drain pan for the convenience waterproof cap of silica gel and the sealed lock of button drain pan, and inside lock sealing part is then for the convenience with the sealed lock of elasticity waterproof part, the setting of casing lock structure is for the convenience buckle formula between button upper cover and the button drain pan to be connected, the vertical spout cooperation on slide guide sand grip and the fixed block realizes the upper and lower slip of slider to realize the break-make of switch.

Preferably, the movable and static contact piece assemblies comprise a sliding block, a movable contact piece assembly and a static contact piece assembly, a longitudinal sliding groove is formed in the outer wall of the sliding block, a movable contact piece clamping groove is formed in the bottom of the sliding block, a movable contact piece spring installation cavity is formed in the movable contact piece clamping groove, and movable contact piece buckles are arranged at two ends of the movable contact piece clamping groove; and two bottom angles in the direction vertical to the opening direction of the movable contact spring clamping groove at the bottom of the sliding block are provided with reset spring mounting cavities, and reset springs are arranged in the reset spring mounting cavities. The structure of the sliding block is convenient for installing the movable contact piece component, and the movable contact piece component is driven to move up and down through the sliding block, so that the movable contact piece component is electrically connected or disconnected with the static contact piece component,

Preferably, the movable contact piece assembly comprises a movable contact piece, a movable contact piece spring and a movable contact piece contact, the movable contact piece is buckled in the movable contact piece clamping groove, and the movable contact piece spring is arranged in the movable contact piece spring installation cavity in a pressing mode through the movable contact piece; the static contact piece assembly comprises silver riveting contacts connected with two static contact pieces and the static contact pieces, and the static contact pieces penetrate through the outer side of the bottom of the key bottom shell.

The utility model has the advantages that: this double-deck waterproof switch through the inside double-deck waterproof construction that sets up of button upper cover and button drain pan at mutual buckle connection, has realized the dual waterproof to the inside movable contact piece subassembly of switch cavity to make the inside electrically conductive airtight space of switch cavity effectively isolated outside aqueous vapor, realized vehicle switch's life-span and stability.

Drawings

Fig. 1 is a schematic structural view of the double-layer waterproof switch of the present invention;

fig. 2 is a sectional view of the double-layer waterproof switch of the present invention;

fig. 3 is a schematic view of an exploded structure of the double-layer waterproof switch of the present invention;

FIG. 4 is a schematic structural view of the silica gel waterproof cap of the present invention;

FIG. 5 is a schematic view of the construction of the elastic waterproof member according to the present invention;

fig. 6 is a schematic structural diagram of the sliding block according to the present invention;

fig. 7 is a schematic structural diagram of the bottom shell of the key of the present invention;

in the figure: 1. a switch cavity, 2, a key top cover, 21, a top cover buckling structure, 3, a key bottom shell, 31, an external buckling sealing part, 32, an internal buckling sealing part, 33, a shell buckling structure, 34, a movable and static contact piece component extending hole, 35, a sliding guide convex strip, 4, a key handle, 41, a waterproof top part, 42, a sleeve necking part, 43, a sliding part, 44, a limiting part, 5, a movable and static contact piece component, 6, a silica gel waterproof cap, 61, a sleeve sealing body, 62, a conical waterproof body, 63, a buckling sealing body, 7, an elastic waterproof piece, 71, a key top pressing part, 72, a fixed block part, 73, an arc waterproof body, 74, a water retaining ring groove, 8, a fixed block, 81, a sliding cylinder body, 82, a pressing body, 9, a sliding block, 91, a longitudinal sliding chute, 92, a movable contact piece clamping groove, 93, a movable contact piece spring installation cavity, 94, a movable contact piece buckle, 95, a reset spring installation cavity, 10. the movable contact assembly comprises a movable contact assembly 101, a movable contact 102, a movable contact spring 103, a movable contact 11, a static contact assembly 111, a static contact 112, a silver riveting contact 12 and a reset spring.

Detailed Description

The technical solution of the present invention will be further described in detail by the following specific embodiments with reference to the accompanying drawings.

Example 1:

in the embodiment shown in fig. 1, 2, and 3, a double-layer waterproof switch includes a key top cover 2 and a key bottom case 3 which are connected to each other in a snap-fit manner to form a switch cavity 1, a key handle 4 which is movably disposed inside the switch cavity 1 and extends to the outside of the key top cover 2, and a movable and static contact piece assembly 5 which is slidably disposed inside the switch cavity 1 to realize power on/off, wherein a double-layer waterproof structure for waterproof sealing of the switch cavity 1 is disposed between the switch cavity 1 and the key top cover 2. The double-layer waterproof structure comprises an outer-layer one-level waterproof structure and an inner-layer two-level waterproof structure.

The outer layer one-level waterproof structure is realized by matching the key handle 4, the key upper cover 2, the key bottom shell 3 and a silica gel waterproof cap 6 which is pressed at the joint of the key upper cover 2 and the key bottom shell 3 and is in sealed sleeve joint with the key handle 4. As shown in fig. 4, the silica gel waterproof cap 6 includes a socket sealing body 61, a tapered waterproof body 62 and a snap sealing body 63 which are integrally arranged. The outer layer one-level waterproof structure is characterized in that a silica gel waterproof cap is arranged between the key upper cover and the key shell, and the silica gel waterproof cap is sleeved on the key handle, so that the first layer isolation is carried out on external moisture. Waterproof cap of silica gel an organic whole sets up and cup joints the seal, toper waterproof body and lock seal, cup joint the seal and press according to the key cap seal cover thereby make outside moisture can not enter into the switch cavity through waterproof cap of silica gel and button handle junction inside, toper waterproof body then can be outside with outside water conservancy diversion to the switch, make water can not enter into the switch cavity through waterproof cap of silica gel inside, also can not store up on the switch, the setting of lock seal is then in order to realize with the sealed cooperation of button drain pan, and make things convenient for the pressfitting of button upper cover.

The inner-layer secondary waterproof structure is realized by matching the key bottom shell 3, the elastic waterproof piece 7 which is hermetically buckled in the key bottom shell 3 and the fixing block 8 which is sleeved on the key handle 4 in a sliding mode and is arranged on the upper portion of the elastic waterproof piece 7 in a pressing mode. As shown in fig. 5, the elastic waterproof member 7 includes a key pressing portion 71, a fixed block pressing portion 72 and an arc waterproof body 73 which are integrally arranged; the key top pressing part 71 is arranged along the axis of the elastic waterproof body 7, and the fixed block crimping part 72 is annularly arranged on the periphery of the arc waterproof body 73; a water retaining ring groove 74 is arranged at the joint of the fixed block crimping part 72 and the arc waterproof body 73; the fixing block 8 comprises a sliding cylinder 81 and a pressing body 82 which are integrally arranged.

Inner layer second grade waterproof construction is through setting up elasticity waterproof part and fixed block inside the button drain pan, through elasticity waterproof part and button drain pan cooperation, and compress tightly the sealing to the switch cavity in the inside realization of button drain pan through the fixed block, in the use, when the button handle is pressed down, the button handle is pressed down elasticity waterproof part, thereby elasticity waterproof part warp downwards and promotes sound contact piece subassembly downwards, make the sound contact piece subassembly realize the electricity and connect, the switch-on, when needing the disconnection switch, then press down once more and loosen, button handle automatic re-setting, make sound contact piece subassembly disconnection electrically conductive. And because the waterproof piece of elasticity is realized sealedly with the button by the fixed block crimping inside the button drain pan in the use, consequently, inside even if outside one-level waterproof construction appears breaking also can not enter into the switch cavity. Elastic waterproof piece includes the integrative button top splenium that sets up, a deformation is pressed to elastic waterproof piece for making things convenient for the button, thereby realize the break-make operation to sound contact piece subassembly, and fixed block crimping portion is for realizing with the fixed block cooperation, make things convenient for the fixed block to be sealed to elastic waterproof piece's crimping, the arc waterproof body is in case the damage has the aqueous vapor to get into for preventing outer one-level waterproof construction, then realize blockking to the aqueous vapor, and the water that is blockked then by leading-in manger plate annular inside can not get into the switch cavity inside, inlayer second grade waterproof sealing has been realized.

The key handle 4 is provided with a waterproof top portion 41, a sleeve neck portion 42, a sliding portion 43 and a limiting portion 44 in an integrated coaxial line, the diameter of the waterproof top portion 41 is larger than that of the sleeve neck portion 42, and the diameter of the limiting portion 44 is larger than that of the sliding portion 43. The button groove an organic whole is provided with waterproof top, cup joint the throat, sliding part and spacing portion, cup joint when cup jointing the throat department as waterproof cap of silica gel, waterproof top just covers waterproof cap's of silica gel end seal, thereby it enters into inside the switch cavity along the button handle from the junction to block the water, and sliding part then is in order to realize the button handle press down and the sliding fit between the fixed block, the setting of spacing portion is in order to realize the button handle reset in-process and to form spacingly between the fixed block, can not lead to the slippage between button handle and the fixed block.

As shown in fig. 7, an external buckling sealing portion 31 and an internal buckling sealing portion 32 are integrally arranged on the upper portion of the key bottom case 3, the external buckling sealing portion 31 is annularly arranged on the outer shell of the open end of the key bottom case 3, the internal buckling sealing portion 32 is annularly arranged on the inner wall of the key bottom case 3, a shell buckling structure 33 is arranged outside the shell of the key bottom case 3, a moving and static contact piece assembly extending hole 34 is arranged at the bottom of the key bottom case 3, and a sliding guide convex strip 35 is longitudinally arranged on the inner wall of the key bottom case 3; the upper cover buckling structure 21 is arranged on the key upper cover 2 in a way of matching with the shell buckling structure 33. The button bottom shell is provided with an external buckling sealing part for facilitating the sealing buckling of the silica gel waterproof cap and the button bottom shell, the buckling sealing body 63 on the silica gel waterproof cap is buckled on the external buckling sealing part, the outer wall of the external buckling sealing body is positioned on the same vertical plane with the outer wall of the button bottom shell, even if external water falls on the silica gel waterproof cap, the water can flow to the outside along the buckling sealing body and cannot enter the switch cavity 1, the internal buckling sealing part is for facilitating the sealing buckling with the elastic waterproof part, and the fixed block crimping part 72 on the elastic waterproof part 7 is arranged on the internal buckling sealing part through the fixed block pressing, so that the sealing of the switch cavity is realized; the buckling connection between the upper cover of the key and the bottom shell of the key is realized by the matching of the buckling structure of the shell and the buckling structure of the upper cover, and the up-and-down sliding of the sliding block is realized by the matching of the sliding guide convex strip and the longitudinal sliding groove on the fixed block, so that the on-off of the switch is realized.

The movable and static contact piece assembly comprises a sliding block 9, a movable contact piece assembly 10 and a static contact piece assembly 11, as shown in fig. 6, a longitudinal sliding groove 91 is formed in the outer wall of the sliding block 9, a movable contact piece clamping groove 92 is formed in the bottom of the sliding block 9, a movable contact piece spring installation cavity 93 is formed in the movable contact piece clamping groove 92, and movable contact piece buckles 94 are arranged at two ends of the movable contact piece clamping groove 92; and two bottom corners of the bottom of the sliding block 9, which are perpendicular to the opening direction of the movable contact spring clamping groove 92, are provided with a return spring mounting cavity 95, and a return spring 12 is arranged in the return spring mounting cavity 95. The lower end of the return spring 12 is abutted against the bottom wall of the bottom shell of the key. The slider slides and sets up inside the button drain pan, and the cooperation of giving on the slider to spout and the inside slip direction sand grip 35 of button drain pan realizes sliding from top to bottom, drives the up-and-down motion of movable contact piece subassembly through the slider to realize being connected or the disconnection with the electricity of stationary contact piece subassembly.

The movable contact spring assembly 10 comprises a movable contact piece 101, a movable contact spring 102 and a movable contact piece contact 103, wherein the movable contact piece 101 is buckled inside the movable contact piece clamping groove 92, and the movable contact spring 102 is pressed inside the movable contact piece spring mounting cavity 93 through the movable contact piece 101; the static contact piece assembly 11 comprises two static contact pieces 111 and a silver riveting contact 112 connected with the static contact pieces 111, and the static contact pieces 111 penetrate through the outer side of the bottom of the key bottom shell 3. The static contact 111 is arranged in an L-shaped structure, the silver riveting contact 112 is vertically connected to one edge of the L-shaped structure of the static contact, and the other edge of the L-shaped structure of the static contact penetrates through the dynamic and static contact component extending hole 34 to be electrically connected with an external circuit. When the key handle is not pressed, the sliding block drives the sliding block component to be separated from the static contact component under the action of the reset spring, namely, the movable contact 103 is not contacted with the silver riveting contact 112 on the static contact, and is in a power-off state.

This double-deck waterproof switch through the inside double-deck waterproof construction that sets up of button upper cover and button drain pan at mutual buckle connection, has realized the dual waterproof to the inside movable contact piece subassembly of switch cavity to make the inside electrically conductive airtight space of switch cavity effectively isolated outside aqueous vapor, realized vehicle switch's life-span and stability.

This double-deck waterproof switch, green field of riding such as widely used in electric motor car, electric bicycle, scooter covers the electric motor car part and contains (outage brake lever, automatically controlled ware, commentaries on classics handle switch assembly etc.) outage switch concrete application, if: lamp control switch, horn switch, brake crank power-off switch, P-shift parking switch, lock control switch, function switch, etc.

This double-deck waterproof switch through double-deck waterproof airtight structure, satisfies the part and normally uses at switch function under the IPX7 bubble water environment, increases durable life-span and functional stability such as vehicle function switch.

The above-described embodiments are only some of the embodiments of the present invention, and not all of them. Meanwhile, based on the embodiments described in the present disclosure, under the premise that creative labor is not made, all other embodiments obtained on the basis of the technical solution of the present application by a person of ordinary skill in the art should belong to the protection scope of the present disclosure.

Claims

1. A double-deck waterproof switch which characterized in that: the switch comprises a key upper cover (2) and a key bottom shell (3) which are connected into a switch cavity (1) in a buckling mode, a key handle (4) which is movably arranged in the switch cavity (1) and extends to the outside of the key upper cover (2), and a movable and static contact piece assembly (5) which is arranged in the switch cavity (1) in a sliding mode to realize power on and power off, wherein a double-layer waterproof structure used for performing waterproof sealing on the switch cavity (1) is arranged between the switch cavity (1) and the key upper cover (2).

2. The double-layer waterproof switch according to claim 1, characterized in that: the double-layer waterproof structure comprises an outer-layer one-level waterproof structure and an inner-layer two-level waterproof structure.

3. A double-layer waterproof switch according to claim 2, characterized in that: the outer layer one-level waterproof structure is realized by matching the key handle (4), the key upper cover (2), the key bottom shell (3) and a silica gel waterproof cap (6) which is pressed at the joint of the key upper cover (2) and the key bottom shell (3) and is hermetically sleeved with the key handle (4).

4. A double-layer waterproof switch according to claim 3, characterized in that: the silica gel waterproof cap (6) comprises a socket sealing body (61), a conical waterproof body (62) and a buckling sealing body (63) which are integrally arranged.

5. A double-layer waterproof switch according to claim 2, characterized in that: the inner-layer secondary waterproof structure is realized by matching the key bottom shell (3), an elastic waterproof piece (7) which is hermetically buckled in the key bottom shell (3) and a fixing block (8) which is sleeved on the key handle (4) in a sliding mode and is arranged on the upper portion of the elastic waterproof piece (7) in a pressing mode.

6. The double-layer waterproof switch according to claim 5, characterized in that: the elastic waterproof part (7) comprises a key top pressing part (71), a fixed block pressing part (72) and an arc waterproof body (73) which are integrally arranged; the key top pressing part (71) is arranged along the axis of the elastic waterproof body, and the fixed block pressing part (72) is annularly arranged on the periphery of the arc waterproof body (73); a water retaining ring groove (74) is arranged at the joint of the fixed block crimping part (72) and the arc-shaped waterproof body (73); the fixing block (8) comprises a sliding cylinder body (81) and a crimping body (82) which are integrally arranged.

7. A double-layer waterproof switch according to any one of claims 1 to 6, characterized in that: the key handle (4) is integrally and coaxially provided with a waterproof top part (41), a sleeve neck part (42), a sliding part (43) and a limiting part (44), the diameter of the waterproof top part (41) is larger than that of the sleeve neck part (42), and the diameter of the limiting part (44) is larger than that of the sliding part (43).

8. A double-layer waterproof switch according to any one of claims 1 to 6, characterized in that: an external buckling sealing part (31) and an internal buckling sealing part (32) are integrally arranged at the upper part of the key bottom shell (3), the external buckling sealing part (31) is annularly arranged on an outer shell at the opening end of the key bottom shell, the internal buckling sealing part (32) is annularly arranged on the inner wall of the key bottom shell, a shell buckling structure (33) is arranged outside the shell of the key bottom shell, a movable and static contact piece assembly extending hole (34) is formed in the bottom of the key bottom shell, and a sliding guide convex strip (35) is longitudinally arranged on the inner wall of the key bottom shell; the upper cover (21) is arranged on the upper key cover (2) in a way of matching with the shell buckling structure.

9. A double-layer waterproof switch according to any one of claims 1 to 6, characterized in that: the movable and static contact piece assembly (5) comprises a sliding block (9), a movable contact piece assembly (10) and a static contact piece assembly (11), wherein a longitudinal sliding groove (91) is formed in the outer wall of the sliding block (9), a movable contact piece clamping groove (92) is formed in the bottom of the sliding block, a movable contact piece spring mounting cavity (93) is formed in the movable contact piece clamping groove (92), and movable contact piece buckles (94) are arranged at two ends of the movable contact piece clamping groove (92); and two bottom corners of the bottom of the sliding block (9) perpendicular to the opening direction of the movable contact spring clamping groove are provided with return spring mounting cavities (95), and a return spring (12) is arranged in each return spring mounting cavity (95).

10. The double-layer waterproof switch according to claim 9, characterized in that: the movable contact piece assembly (10) comprises a movable contact piece (101), a movable contact piece spring (102) and a movable contact piece contact (103), the movable contact piece (101) is buckled in a movable contact piece clamping groove (92), and the movable contact piece spring (102) is arranged in a movable contact piece spring mounting cavity (93) in a pressing mode through the movable contact piece (101); the static contact piece component (11) comprises two static contacts (111) and a silver riveting contact (112) connected with the static contacts, and the static contacts (111) penetrate through the outer side of the bottom of the key bottom shell.